As an MRNA Molecule Is Processed in the Nucleus, It

As an mRNA molecule is processed in the nucleus, it loses some proteins and binds to new ones, some of which are used in mRNA surveillance pathways. The presence of which of the following molecules on an mRNA is a signal that the mRNA is still NOT ready for nuclear export?

A) Cap-binding complex
B) Exon junction complex
C) snRNPs used in splicing
D) poly-A-binding proteins
E) SR proteins

Correct Answer:

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